Going somewhere indeed, which is why I intend to make the most out of the time I have left with you, Rose.

Will you make me privy to this latest undertaking of yours? It sounds most interesting.

Incidentally, I don't think it's their will to adapt as much as it is a spontaneous reaction of their genes and cellular structure to the object or environmental situation in question. But this is merely my speculation, of course. Regardless of that, the genome of Pokémon is extremely flexible - just consider move learning, for a moment, and think of how many different types of powers most Pokémon can master.